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Subject: Re: [boost] [local] this_ or _this?
From: Lorenzo Caminiti (lorcaminiti_at_[hidden])
Date: 2011-04-05 19:52:50


On Sun, Apr 3, 2011 at 2:22 PM, Steven Watanabe <watanabesj_at_[hidden]> wrote:
> AMDG
>
> On 04/03/2011 11:13 AM, Lorenzo Caminiti wrote:
>>
>> Boost.Local uses a special name `this_` to access the object `this`
>> bound from the enclosing scope. Shall this name be `this_` or `_this`
>> according to Boost practices?
>>
>> struct c {
>>     void g(int x) { ... }
>>     void f() {
>>         void BOOST_LOCAL_FUNCTION_PARAMS( (int x) (bind this) ) {
>>             this_->g(x); //<<<<<<<<<  Shall this be `_this->g(x);`
>> instead?
>>             ...
>>         } BOOST_LOCAL_FUNCTIO_NAME(l)
>>         ...
>>     }
>>     ...
>> };
>>
>> In particular, some library uses _ postfix for statements like
>> mpl::if_ (not mpl::_if) while other uses _ prefix for variables like
>> phoenix::local_names::_f (not local_names::f_).
>>
>
> The convention is that _xxx is used for placeholders.
> xxx_ is used when xxx is a keyword.

1) What is the exact definition of a "placeholder"?
2) What is the convention for an xxx that is both a keyword and a placeholder?

Thanks a lot.

--
Lorenzo

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